Squat Sponge 18"long Purple, 3.5&rdquo; diameter & 1.25"thick Olympic Barbell Pad allows for proper form of squats and lunges w/comfort for the upper and lower back and abdomen area sock absorbing low-density foam for cradling the spine Molded thick foam of varying degrees of open and close cell foam; thickness and density with a grooved channel in the center it is18 long, 3.5diameter &1.25 thick that will cradling the spine. Squat Sponge Barbell Cushion Pad has been designed by a guy who loves to do Squats. For more information please look up our website under squat sponge. Squat Sponge the advanced barbell pad.